关键词: 土石坝, 防渗, 高压, 喷射灌浆

Abstract: Since the impoundment of Qiyan reservoir, the seepage behind the dam increased gradually as the water level rose. On April 30, 2015, when the water level reached the elevation 1 218 m, the seepage hit 12 L/s, which was far beyond the designed allowable range and seriously affected the dam safety and stability. After analysis of the investigation results of dam foundation, the previous investigation results and the geological data during construction period, the curtain grouting by high-pressure jet grouting was adopted to control the seepage and the current operation showed that it was effective. This paper introduces the treatment technology, to provide reference for similar projects.

Key words: earth rockfill dam, seepage prevention, high pressure, jet grouting